Originally Posted by ralphiedee
I have an ebook to do from a word doc, the doc has certain spacing lines within paragraphs ( 2 lines) and another spacing in between paragraphs ( 4 lines)...
An ebook should never be formatted this way. You should always use only single spacing between lines an a paragraph and between paragraphs.
When you need wider gaps, you adjust it with changes in the CSS. For example, to add additional space between paragraphs you could set the "margin-top" for the <P> tag to something like 1em instead of 0em.
I also recommend that you seriously review your formatting decision. The opinion that JSWolf expressed is just an opinion, not a rule, but it is an opinion held by the majority of readers and one I agree with. A minority like an extra space between paragraphs but almost nobody likes extra space between lines within a paragraph. The old double-spacing style is antique typewriter formatting, like the obsolete style of placing two spaces after a period, and often required in typewritten documents so that a reviewer/editor/teacher can more easily write in edits, corrections, and/or comments. eBooks should be formatted more in the style of printed books rather than typewritten documents.